The story
- Proto-Germanic · inherited from*fergunją
- Proto-West Germanic · inherited from*fergunī
- Anglian Old English · inherited fromfergen“wooded mountain”
- Middle English · inherited fromFerye on the Hill
- English todayFerryhill
Inherited from Middle English Ferye on the Hill, for earlier Ferie, Feregenne (perhaps to distinguish it from Ferrybridge), from Anglian Old English fergen (“wooded mountain”), from Proto-West Germanic *fergunī, from Proto-Germanic *fergunją. For the phonological development, compare eerie and dialectal swally (“to swallow”).
Etymology from Wiktionary, CC BY-SA 4.0.